You can have high repeatability without high accuracy but you cannot have high accuracy without high repeatability. Typical vortex flow meter accuracy ranges from 0.7% to 2.5%. Repeatability is producing the same outcome given the same conditions. Figure 1 - Basic structure of turbine flow meters. Available for flow ranges from 3/8 to 10. Accuracy +/- 0.5% of rate 32 Shielded with PFC Female Straight Conn. (Mil-E-Qual 2#16-10SL-4) - (11016-20), TI 20 Weatherproof - 22 avg. Follow us on Twitter@Flow_metrics. At best, the recorded flows below 600gpm are inaccurate - at worst they are not recorded at all, and are lost. For example, a variable area flow meter may be listed as having an accuracy class of 4 according to VDI. It typically ranges from 0.1% to 2.5%. 11 endstream endobj 279 0 obj <>/Metadata 276 0 R/OpenAction 280 0 R/Outlines 31 0 R/PageLayout/OneColumn/Pages 275 0 R/StructTreeRoot 32 0 R/Type/Catalog/ViewerPreferences<>>> endobj 280 0 obj <> endobj 281 0 obj <>/MediaBox[0 0 612 792]/Parent 275 0 R/Resources<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 282 0 obj <> endobj 283 0 obj <> endobj 284 0 obj <> endobj 285 0 obj [250 0 0 0 0 833 0 180 333 333 0 564 250 333 250 278 500 500 500 500 500 500 500 500 500 500 278 278 0 0 0 0 0 722 667 0 722 611 556 722 722 333 0 722 0 889 722 722 556 722 667 556 611 722 0 944 0 0 0 0 0 0 0 0 0 444 500 444 500 444 333 500 500 278 278 500 278 778 500 500 500 500 333 389 278 500 500 722 500 500 444] endobj 286 0 obj <> endobj 287 0 obj [250 0 0 0 0 1000 0 0 333 333 0 0 0 0 0 0 500 500 500 500 500 500 500 500 500 0 0 0 0 570 0 0 0 0 0 722 0 667 611 0 778 389 0 778 0 944 0 778 611 0 0 556 667 0 722 0 0 0 0 0 0 0 0 0 0 500 556 444 556 444 333 500 556 278 0 556 278 833 556 500 556 0 444 389 333 556 500 722 500 500 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 750] endobj 288 0 obj <>stream Magnetic flow meters deliver high accuracy for conductive liquids. +1-610-866-6750 We Provide Tools and Basic Information for Learning Process Instrumentation and Control Engineering. Turbine flow meters are a popular way of measuring liquid and natural gas flow. Accuracy is how close your instrument comes to giving you the exact value that exists in the process at that moment. Turbine flow meter is a widely used flow measuring device, used in a wide range of industries for both liquids and gases.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[728,90],'enggcyclopedia_com-medrectangle-3','ezslot_1',112,'0','0'])};if(typeof __ez_fad_position != 'undefined'){__ez_fad_position('div-gpt-ad-enggcyclopedia_com-medrectangle-3-0')}; Turbine flow meters have the ability to measure wide range of flows. Magnetic and ultrasonic flow meters are generally more expensive than variable area flow meters but deliver many features that variable area flow meters cannot. 0000154581 00000 n Some meters are simple and can essentially be calibrated in the field and some require removal from the system and are then sent to a company that can perform the necessary calibration and return it to you. Typical magnetic flow meter accuracy is from 0.2% to 2%. The exact value of the flow in the meter is more than likely not exactly 1 GPM because of the inherent deviation. Check out why you can use a flow meter instead of a weighing scale. Problems may also happen if your meter is calibrated incorrectly or was not properly installed. 0000003646 00000 n On the other hand, applications where flow rates are low will typically use meters that are considered more accurate but tend to impede flow rates, such as displacement meters. Ultrasonic flow meter accuracy is quite high. In addition to regularly scheduled inspections, check your meter in the event that you are receiving inconsistent or unusual readings that cannot be explained by actual variations in the flow. Strainers installed near the meter can help protect the turbine from debris that could damage it. ), ( A plot of % R error against flow gives the graph below: As revealed by the graph, the % Rate Error between the range of low flows and high flows remains constant. When choosing a flow meter, it is helpful to understand exactly what level of accuracy the flow meter will deliver. Percentage of the Full Scale (abbreviated as %FS) which is a fixed inaccuracy based off of the full-scale value applied though out the measuring range. Universals products are characterized by a simple and robust design backed up by high customer service and dedication to quality. It is also worth noting that the accuracy of a single flow meter is also subject to whether the meter is measuring a liquid or a gas. Faster & Semi-continuous dosing System availability Risk reduction, window.dojoRequire(["mojo/signup-forms/Loader"], function(L) { L.start({"baseUrl":"mc.us18.list-manage.com","uuid":"21452a8c3f34506392fbc26d4","lid":"6d449f57a3","uniqueMethods":true}) }), 57 South Commerce Way Wide Temperature Application -450F to +850F There are many elements of an application that can affect whether or not a flow meter delivers the factory stated accuracy. 4 With todays advancements in technology, turbine flow meter accuracy has also improved. While there can be variations in the range of accuracy within a single flow meter technology type, there are some broad generalizations that can be made regarding accuracy for each flow meter technology type. It should never be confused with accuracy. Electrical pulses can also be added and totalized so that we get the aggregate flow rate over a specific time period. This section will guide you to the relevant service & support topics. Malfunction may occur as a result of regular wear and tear, impact by debris, corrosion or buildup of dirt or viscosity. Bronkhorst instruments are used for numerous applications in many different markets. It is often used for verifying the accuracy of other flow meters by running them simultaneously and referencing the measured values between the two. 1 When you see an accuracy specification, it should be expressed as a percent of Full Scale (FS) or Reading (Rd or RD). The rotating blades generate a frequency signal proportional to the liquid flow rate, which is sensed by the magnetic pick-up installed outside of the pipe and transferred to the applicable transducer. Another way in which flow meter makers have reduced inaccuracy is by reducing the rotors inertia. There are many terms that are thrown around interchangeably and incorrectly when it comes to talking about how accurate your instruments results really are. error in the measurement of flow rate when the accuracy of the meter is 2 For example, if you choose a flow meter that requires full pipes and no bubbles to operate correctly and you run the pipe half full and it has bubbles and foam, it will not deliver the accuracy that it is built to. A highly repeatable instrument doesnt necessarily mean that it is then accurate. In a sense, the instrument delivering a resolution of 1 PSI will not be accurate or finite enough for your process, even though it may be accurate in its actual reading. Tel. All Turbines, Inc. products are proudly made in the USA. ), ( Turbine meter measurements can be affected severely by factors such as flow profile, temperature and flow rate and content. endstream endobj 290 0 obj <> endobj 291 0 obj [306 0 R] endobj 292 0 obj <>stream %r 8 #N0S\a9 a8 @ o|Qz!TU -X+ 0000001601 00000 n Accuracy flow measurement is maximized when operating under a turbulent flow profile (high Reynolds number, typically bigger than 10,000). Copyright 2022 Bronkhorst. endstream endobj 293 0 obj <>stream Providing Reliable Flow Measurement since 1983, Accuracy: +/- 0.5% over standard flow range (for 0.25% consult factory), Repeatability: +/- 0.1% over standard flow range, Operating Temperature: -450 F to +450 F (for higher temperatures consult factory), End Connection: Flanged, Victaulic (grooved), 37 AN Flare, or NPT (additional end connections available). For every High Accuracy turbine flow meter manufactured by Turbines, Inc., a unique K-factor is documented by means of NIST-traceable factory or independent laboratory ISO/IEC 17025 certified. Selecting the right flow meter is the key to success. Depending on the different units used for each of the term on right side of the equation, range of values for A : orifice are requirement in mm2 Based on our experience, innovation and sense of responsibility, a relationship with Bronkhorst assures Performance for Life. ), ( h[:A`)*KwZ [Nx4`0a[@EF%4&W4-="$=Y3[,e# 8J26g(q8]_ @ C$G8j#l8o|b|8YJVoowu{ GqOtu{_'{9Y;JU[l?.H|e\R^AOM;AEEitoPHuUbe6T~E5 6T3t_m7*31(G3!=dL' !m >stream There are many different flow meter technologies, and each type delivers different accuracies than other technology types. Some types of turbine meters are also able to measure and record variations in flow with a high degree of precision. endstream endobj 294 0 obj <>stream Effective range and Rangeability are alternative terms used to describe meter turn down. Because the actual principle of operation can vary between this category of flow meters, the range is also wider than some other technologies. Vortex flow meters can also deliver high accuracy. The ways that flow meter accuracy is stated are not always an apples-to-apples comparison, where one could essentially be converted into another. 311 0 obj <>stream This is a measure of a flow meter's performance. For reference, the accuracy ranges for the VDE/VDI classes are below. The FML250 Flow Monitor is a microcontroller based rate / totalizer designed for Liquid Applications. Flow meters are very popular devices that help to determine the quantity of fluids through pipes at any given time. HMo0. N`>=6v%uo#H9m=xf?5zXUsQBWKc'" fx9^8+`k/ h P = Pressure drop Also known as an axial turbine, this type of meter consists of a turbine wheel that is placed in the stream of the flow. The TM Series Liquid Turbine ow meter is a highly- versatile product line that offers all stainless steel, precision- machined components with CD4MCu steel rotors. Flow meter accuracy statements can be expressed as a percentage of either: The error in the measurement of flow rate when the accuracy of the meter is stated as a percent of flow rate can be determined by: Suppose we have a flow meter whose accuracy is stated as 1% of flow rate and is being used to measure flow in the range 0 100gpm then we can determine the errors at 100%, 50%, 25% and 10% of the flow range as: At 100% of flow, Error = 0.01 *100 = 1gpm = 1% Rate, 50% of flow, Error = 0.01*50 = 0.5gpm = 1% Rate, 25% of flow, Error = 0.01*25 = 0.25gpm = 1% Rate, 10% of flow, Error = 0.01*10 = 0.1gpm = 1% Rate. trailer Significant bearing wear is another drawback of turbine flow meters. As shown from this example, while the error is constant at any given flow, the error expressed as a percent of flow rate increases with a decrease in flow rate. When accounted for, in relation to the value being expressed by the meter, it gives you the range that the actual value falls between. %PDF-1.5 % If you install an instrument that only can only give you a reading to the nearest 1 PSI, then that instrument will not deliver enough resolution for you to accurately know what the true reading is, as the instrument is, in essence, rounding up or down. Shielded with PFC Female Straight Conn. (Mil-E-Qual 2#16-10SL-4) - (11016-01), TI 24 - 22 avg. The meaning of Full Scale and Reading will be explained later in this blog. One of the limitations of turbine flow meters is the fact that they have to be used only with clean, low-viscosity, non-corrosive fluids. Coriolis flow meter accuracy is among the highest for flow meter technologies. Check out our top 10 tips for installing your flow meter. Certain flow meter technologies require calibration more often than others and some may not require any calibration at all during their service life. It got its start as a family-owned business making variable flow switches for the automotive industry and today services concrete, defense, chemical processing, mining, wastewater, energy, electronics, laboratories, medical, and many other industries. This is not desirable because at low flow, the errors become considerable. Certain flow meter technology types lend themselves to the accuracy being stated in a particular way that may be different from other flow meter technologies. 0000000016 00000 n To verify that the meter is operating within the factory stated specification you can do the following. Subscribe to our blog and receive every two weeks our update. Feel free to contact us anytime during business hours, we would love to hear from you! 0000003210 00000 n ), ( How to download the free software tools of Bronkhorst? For example, some flow meters require straight, uninterrupted pipeline with no impediments, bends, or valves so much distance before and after the flow meter. Differential pressure orifice flow meter accuracy is generally not as high as some other technology types but delivers significant advantages for particular application fields. 12 0000008465 00000 n For best results in calibration, test your meter under conditions that are as close to normal operating settings as possible, keeping the flow composition, rate and temperature substantially similar. Chemical, Plastics, Metal & Glass Industry. Butno one wants an inaccurate meter, but not all applications require high amounts of accuracy. 7 Suite 120 Datasheet Flow Meter Accuracy & Repeatability. Check out our beginners' guide. Manufacturers also continue to develop blade and rotor materials that are highly sensitive, durable and less vulnerable to drag and other factors that have traditionally decreased accuracy. This, too, is expressed as a percentage. Bronkhorst High-Tech BV the leaders in Mass Flow Meter / Mass Flow Controller technology for gases and liquids, Pressure Controllers and Evaporation Systems. VDI Class 4 would more typically be stated in the US as 2.5% to 4% of Full Scale (FS), as this is the actual accuracy range assigned to Class 4. xref 0000002945 00000 n The more common ways the accuracy of a flow meter can be expressed are as follows. Thermal mass flow meter accuracy is usually not quite as high as Coriolis, Magnetic, Ultrasonic, and Vortex flow meter technology, but still offers an above average accuracy which typically ranges from 1% to 3%. 0000154558 00000 n Our team of expert engineering staff is ready and waiting to provide you free assistance in finding the best solution for your application. For the Turbine meter, minimum flow = 10% of maximum flow = 240gpm, For the Coriolis meter, minimum flow = 1.25% of maximum flow = 30gpm. !d(v:&|b7g| MJz$d;dVc%/(3Q!s1}&f%hkFy|oF{I#UBqS;XA9T-Li5n:3%3 wQd@{eA@4'-WnVO8Rn Shielded with PFC Female Straight Conn. (Mil-E-Qual 2#16-10SL-4) - (11016-20-WP), Learn more about this technology, the manufacturers, the users and the applications here, 1755 East 9 Mile Road, Hazel Park, MI, 48030, US. USA - Bethlehem, PA 18017 A clear understanding of flow meter accuracy is therefore necessary if you must get your flow meter specifications right. A fixed roof tank faces the risk of rupture whenever = Fluid density A flow meters specifications are pivotal elements in choosing which flow meter is right for your application. Also in many industrial control applications, flow metering is critical to deliver control objectives. Our engineers offer decades of experience and expertise. Cryogenic flow meters, monitors, and accessories. API Standards for Pressure Relieving Systems, Pressure Vacuum Relief Valves at Atmospheric Fixed Roof Tanks, Pressure Relief Valve Sizing Calculations Blocked Liquid Discharge, Turbine meters are able to operate under a wide range of temperatures and pressures, Most effective in applications with steady, high-speed flows, Require constant backpressure in order to avoid cavitation, Accuracy adversely affected by bubbles in liquids, A straight run of pipe upstream and downstream the turbine meter needs to be installed to allow homogenisation of the flow pattern. Accuracy versus budget considerations and understanding your applications exact accuracy needs can sometimes be confusing. A typical range is 1.5% to 5%. In essence, it is the ability of the instrument to group the results, as in target shooting or darts. If you need very high accuracy you can have a Coriolis mass flow meter, if high accuracy is less important, you may need a Constant Temperature Anemometry(CTA), like the MASS-STREAM series, or other sensor type. Running flows much lower than the stated minimum flow range for the meter can also cause the meter to suffer accuracy or can cause the meter to not work at all. To ensure full pipes for correct operation, install the flow meter vertically, with the flow running upwards. Good repeatability does not guarantee accuracy. In other words, a flow meter should produce the same readings when operated under the same variables and conditions. 278 34 Powered by. For flow meters that measure by mechanical means, if the accuracy begins to suffer, verify that the functioning elements of the flow meter have not been compromised. Unique Technology | Similar to Vortex Meters | Special Design for Wet Gases | Low Maintenance | High Longevity | Up to 3,500 CFM | Up to 360 PSI | Up to 248 F | ANSI Flanges, New Revolutionary Technology | Highest Accuracies for Low Flows | Superior Vibration Resistance | High Temperature Capacity | Rugged Stainless Steel Build | Up to 5,800 PSI, Innovative| Economical | Fully-featured | Compact | Flow & Temperature Measurement | IO-Link | High Turndown Ratio | Bidirectional | Switch, Transmit, Batch | 2 Configurable Outputs, High Flow Rates | Liquids, Gas, or Steam | Flow, Density, and Temperature Measurement | Precision Batching | High Accuracy | NPT or ANSI Connections | Exotic Materials, Made in the USA | Direct Reading Oil Scale | For Higher Viscosity Media | Easy Installation | Up to 175 PSI | Up to 212 F | NPT Threads | 0.0321 GPM | Optional Switches. 0000002350 00000 n However, this also depends on the specification of either FS (Full Scale) or Rd (Reading). How does this play into accuracy? While it may seem like it may be advantageous to gravitate towards the technology types that deliver extremely high accuracy, those meters may have technological principles or other limitations that do not work with your needs. Q : flowrate in lit/min Shielded with PFC Female Straight Conn. (Mil-E-Qual 2#16-10SL-4) - (11016-10-WP), TI 20 - 22 avg. Industry leading liquid flow measurement. The most accurate flow meters are Coriolis mass flow meters. Picture 1 - Pressure/vacuum relief valves for atmospheric storage tanks Certain flow meters require that the flow profile in the pipe be uniform and non-turbulent. 19 In a sense, it is the smallest part of whatever scale is being used. 22 HTn0)u0\W"5E+E]6.x3g=6]IHP ?.@a6)bc1@82sh. Clamp-on ultrasonic flow meters can be rented by certain companies for this purpose. The accuracy requirements for a flow meter depends a great deal on the exact application. Universal Flow Monitors, Flowmeters.com 2012 2022, Piston VA Flowmeters for Offset Piping Requirements, Modular Sensor Manifold - High Pressure Coolant Flow Monitoring, Kobold Magnetic Flow Meters and Thermal Flow Switches, FLOMEC Battery Operated Turbine and Magnetic Flow Meters, Rocon Resistance Welding Tip Loss Flow Monitors, 1/2" to 12" TI High Accuracy Turbine Flow Meters (HA), 1/2" to 12" TI Turbine Flow Meters for Cryogenics (TMC), TI 10' Cable Assembly with 90 Amphenol Connector (10354-01/10), TI 10 Cable Assembly with Straight Amphenol Connector (10354-02/10), TI 10 Weatherproof Sealed Cable Assembly with Straight Amphenol Connector (10908-01/10), TI 10 Hi-Temp Cable Assembly with 90 Amphenol Connector (10870-01/10), TI 10 Hi-Temp Cable Assembly with Straight Amphenol Connector (10870-02/10), TI 10 Cable Assembly with Amphenol 3-pin Connector (10500-01), TI 18 - 22 avg. If your data is unreliable, if you get different numbers under the same circumstances and setup, there is no way those numbers can all be accurate. But it isnt acceptable if you are mixing pharmaceuticals for consumption or volatile elements. In terms of %R, we obtain 1% at the various levels of flow. The flow pushes the meters angled blades, causing the turbine to rotate. How a Current to Pressure Transducer Works, Common Symbols Used in Process and Instrumentation Diagrams, How to Measure Electric Motor Insulation Resistance, How to Test 3-phase AC Motor Windings with an Ohmeter, How to Read Torque Speed Characteristics of AC Motors, Instrument Abbreviations Used in Instrumentation Diagrams, How to Convert Thermocouple Milivolts to Temperature, Principles & Formulas for Flow Measurement, 2009 - 2022 instrumentationtoolbox.com. Highly configurable materials of construction. In an ideal world, the flow rate reading from your process instrumentation would be perfectly correct, with no type of deviation. Typical Coriolis flow meter accuracy ranges from 0.1% to 0.5%. 2Zx F`V""& Positive displacement flow meter accuracy can be good. At flow rates below these for the turbine and Coriolis flow meters, the meters can no longer give accurate measurements. 0000005391 00000 n Some meters are simple enough that they can be easily repaired by the end user while others must be sent back to the factory to be repaired. 0000074216 00000 n As said before, although you dont want an inaccurate flow meter, not all applications require high amounts of accuracy. ), ( The rate of rotation is typically picked up by electronic coils that are connected to the meters housing, and then turned into readings that can be accessed by the user. 0000144084 00000 n 0000002610 00000 n We are instrumentation experts and would be happy to help you in any way we can with your technical questions. t '=2iYN4W]-m`7\l*x/2RI+S08)w~9,38SHhmpa/L!!lvPqrO '12 How accurate your meter needs to be is important when selecting a flow meter, because usually the more accurate a flow meter, the higher the price. Being a unique and specialized principle of operation developed by KOBOLD for gas measurement applications, there isnt really an industry standard for oscillation flow meters. 0 Are you looking for technical documentation, are you interested to learn more about the measuring principles of Bronkhorst products, or you do want to get in contact with a Bronkhorst Service Engineer? Turndown ratio for turbine flow meters (i.e. Flow rate can be determined based on the turbines rotation rate once it becomes steady. 0000002163 00000 n 0000046706 00000 n With Full Scale, the error remains the same but the percentage changes as the flow goes up and down the flow range. Your email address will not be published. 0000001549 00000 n Shielded with PFC Female Straight Conn. (Mil-E-Qual 2#16-10SL-4) - (11016-10), TI 10 Weatherproof - 22 avg. The essence of the way that the accuracy is stated may be telling you about a different element of the inherent accuracy. Use or rent a flow meter with markedly better accuracy than the one that you have and compare the readings from the far more accurate flow meter. It may be acceptable to stray further from the calibration curve if you are only looking to get an idea of how much is flowing through a pipe. Typical error levels can be as low as +- 0.5% of measured flow rate. It typically ranges from 3% to 5%. In this section you will find an overview of the main markets for our equipment, illustrated with some typical examples of applications. 0000008877 00000 n For this reason, they are often preferred for purposes water distribution, fire protection and for large commercial projects, where a high rate of flow and high pressure is desirable. Specifically engineered to meet the strict standards required for custody transfer, the High Accuracy Meter delivers +/- 0.5% or better accuracy and +/- 0.1% repeatability for low viscosity applications. If you are reading this on any other blog than Flowmetrics it is stolen content. The difference between those can be significant. This is accuracy. >$xFov}wD]^zWTmX&#{~? Clamp-on ultrasonic flow meters are ideal for this application because they are simply strapped to the existing pipeline and there is no system shut down or cutting into pipes. If you are using an older turbine flow meter, be aware that recent developments have substantially improved measurement accuracy; thus, it may be wise to invest in an updated model. Pelton wheel flow meters, which are a certain type of paddle wheel flow meter, deliver higher accuracy than standard overshot paddle wheel flow meters, with a typical range of 1.5% to 3%. Some of them are accuracy, repeatability, and resolution. The turn down ratios of some common flow meters in use are given below: As shown in the table above, if we are using these flow meters to measure a given liquid in an application where the expected maximum flow rate is 2,400gpm then: For the Orifice plate meter, minimum flow = 25% of maximum flow = 600gpm. HTM0WK+@Z^fc`MV;34UTE{>L>|)BAVPPqT&c9iDxh=tA+|0v|)12WYfzl,rdBCOD$8tJ2 4,e7pQJF:nK!2hjf$%wbzLH@8Ga|YD^vU%*2'3RYh-0=tyX,G0=zr-I\`X|SLKK'4Nuu^$U|^V zU]d\-b|.) rXJ`kwta-J%Zis3{u L)#h6K/]lviJk?L}. Magnetic flow meters, ultrasonic flow meters, and positive displacement flow meters generally deliver higher accuracy than flow meters that employ a more mechanical means of measurement like variable area flow meters. ), ( However, for your exact application needs, a simple variable area flow meter may deliver sufficient accuracy at a significant cost savings. However, at flow rates lower than 600gpm this flow meter cannot meet its stated specification, so large flow errors occur. Some manufacturers have developed a ''bearingless design'' in order to resolve this problem. 5 Imagine that you have a process that demands that you know down to the tenth of a PSI to operate correctly. 0000004163 00000 n 0000006683 00000 n Our DOG oscillation flow meter for gases delivers an accuracy of 1.5%. the ratio maximum flow / minimum flow that can be measured) can reach values up to 30:1 or even bigger, with good accuracy. So whatever the area of application of your flow meter, you need to understand the terminology used in flow meter specifications and also the accuracy level of the device. Typical ultrasonic flow meter accuracy ranges from 0.7% to 1%. 0000000976 00000 n While some problems can be fixed by recalibrating or performing minor repairs, others may necessitate partial or total replacement. <<778A38980D3C404FADA576DDB0D9F9C9>]/Prev 605651>> 9 G : Specific gravity of the liquid = 1 (for water) Our High Accuracy turbine flow meters are built with extremely tight tolerances only achievable with our precision manufacturing processes, comprehensive quality control, and in-house calibration capabilities. As the fluid flows through the pipe, the rotor spins at a speed which is proportional to the fluid's velocity. sales@bronkhorstusa.com. One advantage of a turbine flow meter is that it offers minimal disruption to the flow. 5 Signs Your Flow Control Equipment Needs An Upgrade? It is the amount of error that can occur when measurements are taken with the flow meter. 0000009044 00000 n The unit has optional temperature compensation which makes adjustments to the flow calculations as needed with temperature fluctuations. Universal Flow Monitors, Inc was incorporated in 1963. Call us now for knowledgeable help to eliminate headaches down the road from incorrect flow meter selection. Our vast in-stock inventory and expedient delivery capabilities are due to our investments in cutting-edge manufacturing, and our network of dedicated facilities and partners. To learn more about each technology type and how they operate, visit our What is a flow meter article. But if it is 5 degrees off every single time, calibration can come into play and turn a highly repeatable instrument into one that is highly accurate after the identified and consistent degree of separation from the actual temperature is accounted for. The KOBOLD brand name became synonymous with superior quality and technological advancement in instrumentation engineering. This describes the ability of a flow meter to indicate the same value for an identical flow rate on more than one occasion. The error in the measurement of flow rate when the accuracy of the meter is stated as a percent of full scale can be determined by: Consider a flowmeter with a stated accuracy of 1%FS. KOBOLD tests their flowmeters for accuracy verification before shipping them to the customer. 0000006107 00000 n Specifically engineered to meet the strict standards required for custody transfer, the High Accuracy Meter delivers +/- 0.5% or better accuracy and +/- 0.1% repeatability for low viscosity applications. Accuracy is the most common term and is sometimes used incorrectly. It is very important to select a flow meter with sufficient range for the application. Lets start with explaining what these two parameters mean: In general it can be said; the lower the percentage, the more accurate your flow meter. Unfortunately, this is not the case and the margin of error that is inherent in measurement must always be identified, accounted for, and minimized when possible. Since the turn down of the Orifice meter is 4:1, this means that at flow rates between 600gpm and 2,400gpm the flow meter can still meet its claimed or stated accuracy.

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